Automotive tractor unit, more particularly for riding and working on vertical walls, ceilings and suchlike

Abstract

The invention pertains to an automotive tractor unit, more particularly for riding and working on vertical walls and ceilings, of the type which consists mainly of a frame; of belt shaped progression elements or tracks which are appropriately driven and are provided with adhesion devices such as suction discs or magnets as well as with elements for attaching appropriate accessories or tools such as a spraying piston or suchlike to the tractor. The belts or tracks are fitted so as to hinge with respect to the frame and around shafts which extend in the longitudinal sense of the tractor.

What we claim is: 
     
       1. An automotive tractor unit for traversing vertical walls and ceilings, including a frame and two separate driving assemblies mounted on distinct sides of said frame, each of said driving assemblies including a support pivotally mounted on an axle parallel to the longitudinal axis of said frame, a set of wheels including at least two wheels mounted on each said support and having axles substantially perpendicular to said longitudinal axis, said driving assemblies each including a motor driving one of said two wheels, a flexible endless belt arranged on said two wheels, said belt carrying a plurality of rows of surface gripping devices, a series of rollers mounted on each said support above an upper stretch of said belt, so as to exert a pressure on said upper stretch and so as to push said upper stretch in the direction of the lower stretch of said belt.